I think this is funny, via techcrunch:
This is not the first attempt to parody or lash back at more mainstream (and self-serious) social networking websites and the general trend towards constant online interconnectedness. Way back in Spring 2006 we reported on a couple of anti-social web services, and this past August we wrote about a website that encourages users to unplug themselves from everything, including each other. With the development of the Facebook platform, we are even seeing these efforts made within Facebook itself, with the Enemybook app.
The interesting point is:
Why hate outside of Facebook, when you can hate within it?
There are already 31 comments at the original article page when i post this, most are fun.